Abstract

This document defines a mechanism to run Bidirectional Forwarding
Detection (BFD) on Link Aggregation Group (LAG) interfaces. It does
so by running an independent Asynchronous mode BFD session on every
LAG member link.

This mechanism allows the verification of member link continuity,
either in combination with, or in absence of, Link Aggregation
Control Protocol (LACP). It provides a shorter detection time than
what LACP offers. The continuity check can also cover elements of
Layer 3 (L3) bidirectional forwarding.